<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      /*
              Object.isFrozen 判断是否冻结
            */
      let obj = {};
      let obj2 = { name: 'test' };
      Object.freeze(obj2);
      console.log(Object.isFrozen(obj2)); // true
    </script>
  </body>
</html>
